Description : For process boilers , combustion air fans must meet the following requirements ___ a. The fan motor shall be driven by a variable speed drive b. The fan motor shall include controls that limit the fan motor demand to no more than 30 %. c. Both a. & b. d. None of the above
Last Answer : c. Both a. & b.
Description : Combustion air positive shut-off shall be provided on all newly installed _______ a. Grant boilers b. Process boilers c. Worcester boilers d. All of the above
Last Answer : b. Process boilers
Description : Oxygen trim control strategy __ a. continuously measures the oxygen content in the flue gas b. adjusts the combustion air flow c. Continually tuning the air-fuel mixture. d. All of above
Last Answer : d. All of above
Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature
Last Answer : A]Increase thermal efficiency of boiler
Description : Process boilers with capacity of 2.5 MMBtu/h and above are also referred as _ a. Natural draft boilers b. Atmospheric boilers c. Both a. And b. d. None of the above
Last Answer : a. Natural draft boilers
Description : A boiler is an enclosed vessel that provides a means for ________ and ______ heat to water until it becomes hot water or steam. a. Generate, boiler b. Condenser, loop c. Combustion, transfers d. All of above
Last Answer : c. Combustion, transfers
Description : Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __ a. by commanding a servo motor to adjust the combustion air damper b. By commanding servo motor to adjust the fuel supply valve. c. Both a. & b. d. None of the above.
Description : Industrial boilers are closed vessels that use a fuel source or electricity to generate ________for industrial purposes. • Fuel Food • Steam
Last Answer : • Steam
Description : Boilers are used in places like 1. Domestic heating 2. Commercial heating 3. Industrial heating application 4. All of above
Last Answer : 4. All of above
Description : High pressure boilers operate at 1. Lower than 15 psig 2. Higher than 15 psig 3. 15 psig 4. None of above
Last Answer : 2. Higher than 15 psig
Description : A safety valve usually employed with stationary boilers is (A) Lever safety valve (B) Dead weight safety valve (C) High steam and low water safety valve (D) All of these
Last Answer : (D) All of these
Description : Steam Boilers is used in _________industries • Heating Requirement for Facility. • Steam for Batching. • Steam for Processing. • All of the above
Last Answer : • All of the above
Description : Where are steam boilers used in the industries a) heating requirement for facility b) steam for batching c) steam for processing d) all of the above
Last Answer : d) all of the above
Description : The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above
Last Answer : c) Steam jet
Description : Water tube boilers produces steam at a________ pressure than that of fire tube boilers. a) Higher b) Lower c) Same d) None of the above
Last Answer : a) Higher
Description : Fire tube boilers are those in which a) Flue gases pass through tubes and water around it b) Water passes through the tubes and flue gases around it c) Work is done during adiabatic expansion d) Change is enthalpy
Last Answer : a) Flue gases pass through tubes and water around it
Description : Water tube boilers are those in which a) Flue gases pass through tubes and water around it b) Water passes through the tubes and flue gases around it c) Work is done during adiabatic expansion d) Change is enthalpy
Last Answer : b) Water passes through the tubes and flue gases around it
Description : Combustion is the ideal air/fuel ratio where a. the mixing proportion is correct, b. the fuel is completely burned c. the oxygen is entirely consumed d. All of the above
Last Answer : d. All of the above
Description : It is easy to detect and monitor excess air a. As oxygen not used for combustion is heated and discharged with the exhaust gases. b. Oxygen is discharged without heating c. Both a. & b. d. None of above
Last Answer : a. As oxygen not used for combustion is heated and discharged with the exhaust gases.
Description : A flue damper and a vent damper are two examples of _______ a. Combustion air positive shut off devices b. Combustion air negative shut off devices c. Both a. & b. d. None of the above
Last Answer : a. Combustion air positive shut off devices
Description : Which of the following is the combustion accessory of a boiler? • Fuel oil system • Gas system • Coal system • All of the above
Description : Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above
Description : Boiler works from application of which type of energies 1. Fuel combustion 2. Electricity 3. Nuclear energy 4. All of above
Description : Boiler is a enclosed vessel that provides a) Expansion b) Ignition c) Combustion d) None of the above
Last Answer : c) Combustion
Description : Presence of moisture in fuel oil would (A) Keep the burner tips cool (B) Aid in proper combustion (C) Because sputtering, possibly extinguishing flame (D) Clean the nozzles
Last Answer : (D) Clean the nozzles
Description : Basic Parts of a Boiler. Burner, • the combustion chamber, • the heat exchanger • All of the above
Description : A __________ is a type of heat exchange system where water is heated to its' boiling point via combustion of a fuel blown through a tube submerged in water. a. Condensate loop b. Hyperbolic cooling tower c. Steam boiler d. All of above
Last Answer : c. Steam boiler
Description : The generated heat is transferred to water to make ______ the process of boiling. • Steam • Boiler • Both • None
Description : The heat in the boiler is used for making ______ a) steam b) condensing process c) ice d) none of these
Last Answer : a) steam
Description : Condensate is the liquid formed when steam passes from the ________ to the ______ state. a. Vapor, solid b. Solid, liquid c. Vapor, liquid d. None
Last Answer : c. Vapor, liquid
Description : Thermal of well-maintained boiler will be of the order ______ a. 30% b. 55% c. 90% d. 45%
Last Answer : c. 90%
Description : Direct relation between…….. &………of saturated steam, the amount of energy input to process easy to control. a) volume, pressure b) volume, temperature c) temperature, pressure d) None of above
Last Answer : c) temperature, pressure
Description : Find false statement about effect of sulphur in fuel? (A) It has heating value (B) It helps in electrostatic precipitation of ash in flue gases (C) It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low (D) It erodes furnace walls
Last Answer : (D) It erodes furnace walls
Description : Which of these is an output of a ‘Furnace’? a. Fuel gas b. Cool Air c. Flue gases d. Water Vapor
Last Answer : c. Flue gases
Description : When gas changes to liquid through the process of condensation, the temperature A] Increases. B] Decreases C] Remains constant. D] None of the mentioned
Last Answer : C] Remains constant.
Description : In a condensation process, _______ to _________ A] Gas, Solid B] Gas, Liquid C] Liquid, Gas D] Liquid, Solid
Last Answer : B] Gas, Liquid
Description : To reduce the stack loss, heat recovery from flue gas can be done by (A) Preheating of cold stock (B) Preheating of combustion air (C) Steam generation in waste heat boilers (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : If the water level inside the boiler were not carefully control cased… a) explosion b) overheat and fail c) both a) & b) d) None of above
Last Answer : c) both a) & b)
Description : Why single boiler unit per turbine is equipped commonly? • For better turbine control • To reduce the cost • For overcoming losses of power • To improve the efficiency
Last Answer : • For better turbine control
Description : In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is (A) 0.007 bar (B) 0.053 bar (C) 0.06 bar (D) 0.067 bar
Last Answer : (D) 0.067 bar
Description : Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder
Last Answer : (C) Heated to its ignition point
Description : Detecting and monitoring carbon monoxide assures the air/fuel ratio is not too rich as a. The excess air is trimmed b. Excess air is let out c. Both a. & b. d. None of above
Last Answer : a. The excess air is trimmed
Description : What is the function of boiler? • To burn the fuel in a confined closed system With the supply of air • To generate steam in varying pressure • To generate steam at constant pressure • To produce flue gases by burning fuel at a given pressure
Last Answer : • To generate steam at constant pressure
Description : What is the reason to service a cooling tower? a) to ensure proper air flow b) to clean the tubes c) to inspect the water pump d) all of these
Last Answer : all of these
Description : What happens when air dissolves in condensate? a) non corrosive b) temperature of air increases c) corrosive d) none of above
Last Answer : c) corrosive
Description : Steam is regularly used for propulsion (as a driving force) in applications such as ________ turbines. • Gas turbine • Steam turbine • Water turbine
Last Answer : • Steam turbine
Description : Which cooling Towers use a process similar to the one found in small evaporation active cooling units a) hyperbolic b) Tower c) condensate loop d) none of these
Last Answer : a) hyperbolic
Description : Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process
Last Answer : (B) Non-heat transfer process
Description : On mollier chart ,free expansion or throttling process from High pressure to atmosphere is represented by • Horizontal straight line • Vertical straight line • Straight inclined line • Curved line
Last Answer : • Horizontal straight line
Description : Process boiler is a type of boiler with a capacity of ____________Buts per hour a) 200,000 b) 300,000 c) 400,000 d) 50,000
Last Answer : b) 300,000